It's a good question. When you say fan-base, do you mean something like "Catching Up" or Piemations or something unofficial where it features a character/property owned by another studio (think Star Wars fan films or those pixel Mario shorts Nickramer mentioned)?
Originally Posted by: Toonatic
For a bit of clarification, Is the "Catching Up" cartoon, an example of a "fan-base cartoon" because it's an indie animation with a sizeable following attached to it?
Then I wonder if stuff like "Homestar Runner", "Salad Fingers", "Foamy The Squirrel", "Xiao Xiao", Or maybe "Madness Combat" would be in that category?
Also, and excuse my ignorance on the subject, but I thought DAICON III and IV were original works that cameos a multitude of characters from different IPs. Would that be more in the Parody realm? Or do we mean something like an unofficial Fan-Made Episode / Sequel / Spiritual Successor? Where they follow the same kind of structure that the original work has. I think there is a South Park Fan Episode called "Trey Gets Stoned" and also My Little Pony Friendship is Magic brought out the Fan Film: "Double Rainboom" if that's any significance
The only thing I can think for something in retrospect, would be a South Park animator, Amy Winfrey, made the Web Series "Making Fiends" which later became a show on Nickelodeon, but then later after it got cancelled, had a few new episodes released on the Web again. Perhaps there could be a sub category of Web Animated works that also have TV-Shows, but I imagine that there are too few examples.